'Firebase authentication - fix country

We are using firebase mobile authentication in ionic application. We have set default country code to 'IN' the setting. below is the code:

 signInOptions: [
        {
          provider: firebase.....,
          defaultCountry: 'IN',
        },
      ],

Now, we want to fix the country country code to 'IN' (User should not be able to change).
Please suggest how to achieve this?

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